The practice of gathering a large group of African-American people together in a crowded environment and simultaneously beginning to target and assault any white people in the vicinity. It is similar to a traditional flash mob in that the event is pre-planned via text message, social networking, or e-mail. Instead of breaking out into a coordinated song and dance, the people involved assault nearby white people and vandalize and loot nearby vendors.

For example, on August 4, 2011, a group of approximately 100 Africa-American teenagers launched a Milwaukee Flash Mob at the state fair grounds in West Allis, WI following an M.C. Hammer concert.